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webscraping-ai

WebScraping-AI MCP Server

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webscraping_ai_selected

Extract content from a web page using a CSS selector. Choose JSON or text output, enable JavaScript rendering, and select proxy type for anti-bot protection.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesURL of the target page.
selectorYesCSS selector to extract content for.
formatNoResponse format (json or text).json
timeoutNoMaximum web page retrieval time in ms (20000 by default, maximum is 30000).
jsNoExecute on-page JavaScript using a headless browser (false by default).
js_timeoutNoMaximum JavaScript rendering time in ms (3000 by default).
wait_forNoCSS selector to wait for before returning the page content.
proxyNoType of proxy: datacenter, residential, or stealth (datacenter by default). Use residential if the site restricts datacenter traffic, or stealth for the most heavily protected sites with advanced anti-bot detection. Residential and stealth requests cost more than datacenter — see the pricing page.datacenter
countryNoCountry of the proxy to use (US by default).
custom_proxyNoYour own proxy URL in "http://user:password@host:port" format.
deviceNoType of device emulation.
error_on_404NoReturn error on 404 HTTP status on the target page (false by default).
error_on_redirectNoReturn error on redirect on the target page (false by default).
js_scriptNoCustom JavaScript code to execute on the target page.

Implementation Reference

  • src/index.js:311-329 (registration)
    Registration of the 'webscraping_ai_selected' tool via server.tool() with schema and handler
    server.tool(
      'webscraping_ai_selected',
      {
        url: z.string().describe('URL of the target page.'),
        selector: z.string().describe('CSS selector to extract content for.'),
        format: z.enum(['json', 'text']).optional().default('json').describe('Response format (json or text).'),
        ...commonOptionsSchema
      },
      async ({ url, selector, format, ...options }) => {
        try {
          const result = await client.selected(url, selector, options);
          const content = format === 'json' ? JSON.stringify({ html: result }) : result;
          return createSanitizedResponse(content, url);
        } catch (error) {
          const errorObj = JSON.parse(error.message);
          return createSanitizedResponse(JSON.stringify(errorObj), url, true);
        }
      }
    );
  • Handler function for 'webscraping_ai_selected' - calls client.selected(url, selector, options) and formats response
    async ({ url, selector, format, ...options }) => {
      try {
        const result = await client.selected(url, selector, options);
        const content = format === 'json' ? JSON.stringify({ html: result }) : result;
        return createSanitizedResponse(content, url);
      } catch (error) {
        const errorObj = JSON.parse(error.message);
        return createSanitizedResponse(JSON.stringify(errorObj), url, true);
      }
    }
  • Schema (input validation) for 'webscraping_ai_selected' - url, selector, format, plus commonOptionsSchema
    {
      url: z.string().describe('URL of the target page.'),
      selector: z.string().describe('CSS selector to extract content for.'),
      format: z.enum(['json', 'text']).optional().default('json').describe('Response format (json or text).'),
      ...commonOptionsSchema
    },
  • WebScrapingAIClient.selected() method - makes API request to '/selected' endpoint with url and selector
    async selected(url, selector, options = {}) {
      return this.request('/selected', {
        url,
        selector,
        ...options
      });
    }
  • Common options schema shared across all tools including webscraping_ai_selected
    const commonOptionsSchema = {
      timeout: z.number().optional().default(DEFAULT_TIMEOUT).describe(`Maximum web page retrieval time in ms (${DEFAULT_TIMEOUT} by default, maximum is 30000).`),
      js: z.boolean().optional().default(DEFAULT_JS_RENDERING).describe(`Execute on-page JavaScript using a headless browser (${DEFAULT_JS_RENDERING} by default).`),
      js_timeout: z.number().optional().default(DEFAULT_JS_TIMEOUT).describe(`Maximum JavaScript rendering time in ms (${DEFAULT_JS_TIMEOUT} by default).`),
      wait_for: z.string().optional().describe('CSS selector to wait for before returning the page content.'),
      proxy: z.enum(['datacenter', 'residential', 'stealth']).optional().default(DEFAULT_PROXY_TYPE).describe(`Type of proxy: datacenter, residential, or stealth (${DEFAULT_PROXY_TYPE} by default). Use residential if the site restricts datacenter traffic, or stealth for the most heavily protected sites with advanced anti-bot detection. Residential and stealth requests cost more than datacenter — see the pricing page.`),
      country: z.enum(['us', 'gb', 'de', 'it', 'fr', 'ca', 'es', 'ru', 'jp', 'kr', 'in']).optional().describe('Country of the proxy to use (US by default).'),
      custom_proxy: z.string().optional().describe('Your own proxy URL in "http://user:password@host:port" format.'),
      device: z.enum(['desktop', 'mobile', 'tablet']).optional().describe('Type of device emulation.'),
      error_on_404: z.boolean().optional().describe('Return error on 404 HTTP status on the target page (false by default).'),
      error_on_redirect: z.boolean().optional().describe('Return error on redirect on the target page (false by default).'),
      js_script: z.string().optional().describe('Custom JavaScript code to execute on the target page.')
    };
Behavior1/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Tool has no description.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness1/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Tool has no description.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Tool has no description.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Tool has no description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose1/5

Does the description clearly state what the tool does and how it differs from similar tools?

Tool has no description.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines1/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Tool has no description.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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